字符串作函数参数

#define  _CRT_SECURE_NO_WARNINGS  #include <stdlib.h> #include <string.h> #include <stdio.h>

//char *p = "abcd111122abcd3333322abcd3333322qqq"; //求字符串p中 abcd出现的次数 //1请自定义函数接口,完成上述需求 50 // i++ ++ ++ //2 自定义的业务函数 和 main函数必须分开 50

void main81() { //strstr(str, str2)
    int ncount = 0; //初始化 让p指针达到查找的条件
    char *p = "11abcd111122abcd3333322abcd3333322qqq"; do { p = strstr(p, "abcd"); if (p != NULL) { ncount++; //             p = p + strlen("abcd"); //指针达到下次查找的条件
 } else { break; } } while (*p != '\0'); printf("ncount:%d \n", ncount); system("pause"); return ; } void main88() { int ncount = 0; //初始化 让p指针达到查找的条件
    char *p = "2abcd3333322qqqabcd"; while ( p = strstr(p, "abcd")) { ncount ++; p = p + strlen("abcd"); //让p指针达到查找的条件
        if (*p == '\0') { break; } } printf("ncount:%d \n", ncount); printf("hello...\n"); system("pause"); } //char *p = "abcd111122abcd3333322abcd3333322qqq"; //求字符串p中 abcd出现的次数 //1请自定义函数接口,完成上述需求 50 // i++ ++ ++ //2 自定义的业务函数 和 main函数必须分开 50
int getCount(char *mystr /*in*/, char *sub /*in*/,int *ncount) { int ret = 0; int tmpCount = 0; //初始化 让p指针达到查找的条件
    char *p = mystr; //不要轻易改变形参的值

    if (mystr==NULL || sub==NULL ||ncount==NULL) { ret = -1; printf("func getCount() err:%d (mystr==NULL || sub==NULL ||ncount==NULL) \n", ret); return ret; } do { p = strstr(p, sub); if (p != NULL) { tmpCount++; //             p = p + strlen(sub); //指针达到下次查找的条件
 } else { break; } } while (*p != '\0'); *ncount = tmpCount; //间接赋值是指针存在的最大意义
    return ret; } int main() { int ret = 0; char *p = "abcd111122abcd3333322abcd3333322qqq"; int count = 0; char sub[] = "abcd"; ret = getCount(p,sub,  &count); if (ret != 0) { printf("func getCount() err:%d \n", ret); return ret; } ret = getCount(p,NULL,  &count); if (ret != 0) { printf("func getCount() err:%d \n", ret); return ret; } printf("count:%d \n", count); system("pause"); }